I would like to create E-R diagrams. It can be done with TikZ. But a whole set of commands have to be written. And every time I have to draw a E-R diagram, I have to write them back. I would like to create a package and using my \usepackage{} command I would like to use the new macros defined. How do I create a custom package and update my TeXlive according to it?

There are two parts here. 1. How to write a package? For this you may search in this site. 2. How to make texline find your package? Again there are answers here suggesting you to make use of localtexmf folder. :)
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Harish KumarMar 4 '14 at 6:57

1 Answer
1

I did something similar for styles in graph theory.
Assuming you're on a UNIX-based system (or on Windows with Cygwin/MinGW installed),
you can use the install tool coupled with a lesser-known use of kpsewhich: